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Watermelon Update. GFVGA Annual Meeting. Watermelon Weed Management. Strategy Sandea Pigweed control Nutsedge control Morningglory control. Strategy. cucumbers, melons, squash and watermelons contains 1.6 lb ethalfluralin (Curbit) and 0.5 lb clomazone (Command) per gallon. Curbit. - PowerPoint PPT Presentation
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Watermelon Update
GFVGA Annual Meeting
Watermelon Weed Management
1) Strategy
2) Sandea
3) Pigweed control
4) Nutsedge control
5) Morningglory control
Strategy
• cucumbers, melons, squash and watermelons
• contains 1.6 lb ethalfluralin (Curbit) and 0.5 lb clomazone (Command) per gallon
Curbit
• removed from the market????
• replaced with Strategy
Strategy
Soil Broadcast Amount of Amount of
Texture Rate Curbit Command
Coarse 2-3 pt 1-1.5 pt 0.33-0.5 pt
Medium 3-4 pt 1.5-2 pt 0.5-0.67 pt
Fine 4-6 pt 2-3 pt 0.67-1 pt
Georgia use rate for most fields should be 2-3 pt/A.
Strategy
• DO NOT incorporate prior to planting
• DO NOT apply under or OVER row covers, mulches, or other plant covers
• Beware of the potential for heavy rain
• Do not make broadcast applications to transplants
Watermelon Injury from Strategy Applied Topical 1 wk After Transplant
Strategy
• Apply prior to weed emergence
• Apply to seeded crop prior to emergence, or apply as a banded spray between rows after crop emergence or transplanting.
Strategy
• Should be able to obtain same rate of ethalfluralin (Curbit).
• Command should enhance activity of annual grasses (expect Texas panicum), sida, croton, lambsquarters.
• Buffer restrictions are identical to Command applied alone
• Be aware of carryover from clomazone
Gowan Company &
Possible preemergence label for watermelon
Watermelon Label
-- Row middle application, 2003
– WILL NOT ALLOW POST APPLICATION
– Possible PRE label in 2004
Cooperative work with Ken Lewis, Crisp Co. and Tom Jennings, Wilcox Co.
Nontreated Sandea (0.024 lb ai/A)
Watermelon farm in Crisp County, May 2000. Treatment at 1-leaf. Pictures to scale.
Sandea for PRE Weed Control
common cocklebur
wild radish
pigweeds
common ragweed
common lambsquarters
yellow nutsedge - suppression purple nutsedge - suppression
2 to 3 weeks residual weed control
Pigweed Control by Sandea
• 0.67 oz PRE = 90 to 100%
Non-treated Control Sandea (0.5 oz/A) PRE
W1-00. Halosulfuron study with Ken Lewis in Cordele.
Nutsedge Control by Sandea
• 0.67 oz PRE = 65-80% for about 3 wk
Sandea PRE
No herbicide
non-treated Sandea 2/3 oz + Curbit 1.5 pt
15
DAT
Pigweed Management
Pigweed Management
1) Curbit preemergence
2) Strategy preemergence
3) Alanap preemergence or postemergence
4) Treflan row middle
Pigweed Response to Watermelon Herbicide Systems at 26 DAT.
Crisp/Wilcox Co. 2002.
Curbit, 1.5 pt/A; Strategy, 3 pt/A; Sandea 0.75 oz/A; Alanap 5 qt/A.
0
20
40
60
80
100
Curbit Strategy Strategy +Sandea
Strategy +Alanap
Sandea +Alanap
% c
ontr
ol
bb
a a a
Pigweed Response to Watermelon Herbicide Systems at 42 DAT.
Crisp/Wilcox Co. 2002.
Curbit, 1.5 pt/A; Strategy, 3 pt/A; Sandea 0.75 oz/A; Alanap 5 qt/A.
0
20
40
60
80
100
Curbit Strategy Strategy +Sandea
Strategy +Alanap
Sandea +Alanap
% c
ontr
ol cb
aa
a
Reduction of Herbicide Control
Tillage that disrupts herbicide layer will
reduce control drastically
Morningglory and Nutsedge
• Sandea row middle for nutsedge
• Tillage and competitive crop
Read Labels
1) Sandea carryover or tank clean out issues
2) Command or Strategy buffer requirements
Gowan Company &